My bro's '94 has a wierd problem. On two occasions, it has idled poorly or stumbled at idle in gear, and replacing or regapping the plugs has fixed the problem.
On the latest occasion, the plugs were at .036" (spec is .031" he tells me - I don't recall offhand), and it was threatening to stall when idling in gear. He reset the plug gap to .026" and the problem went away. The truck has new plug wires, and over 200K on the engine, but a new head gasket, etc. The plugs he regapped were not terribly old or in bad shape, and he did not clean them - just regapped them. He figures this tighter-than-stock gap will burn its way out to the OEM spec. These are all Toyota/ND plugs from the dealer.
Anyone else have an stumble-at-idle problem caused by a slightly large plug gap? Most vehicles with electronic ignition can run huge gaps with little or no performance hit.
Steve
On the latest occasion, the plugs were at .036" (spec is .031" he tells me - I don't recall offhand), and it was threatening to stall when idling in gear. He reset the plug gap to .026" and the problem went away. The truck has new plug wires, and over 200K on the engine, but a new head gasket, etc. The plugs he regapped were not terribly old or in bad shape, and he did not clean them - just regapped them. He figures this tighter-than-stock gap will burn its way out to the OEM spec. These are all Toyota/ND plugs from the dealer.
Anyone else have an stumble-at-idle problem caused by a slightly large plug gap? Most vehicles with electronic ignition can run huge gaps with little or no performance hit.
Steve
